Hilary Duff Is Reportedly Back With Her Ex-Boyfriend

Last month, there were reports that Hilary Duff had broken up with boyfriend and singer Matthew Koma and now it looks like she's moved on... with someone we already know.

Remember last year when she was dating personal trainer, Jason Walsh? Well they were just spotted working out together in New York and, according to an E! News source, the reunion was "very flirty."

"They were playful with each other. They were near the bike path on the West Side Highway near Chelsea Piers. They would pause to talk in between workouts. She was laughing a lot," the sneaky onlooker spilled.

But they were also pretty careful to keep the PDAs to a minimum, with the eyewitness adding that they "weren't holding hands or kissing," though they reportedly "left together and went into her apartment building together."

And while Hilary might not be ready to go public with their reunion, she did share a cryptic snap of their location on Insta, which she captioned "Detour...."